JPS6115253B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an automatic operating device for a fuel supply system of a gas engine that uses fuel gas (hereinafter referred to as gas) as a main fuel and ignition oil (hereinafter referred to as oil) as an auxiliary fuel. Conventional fuel supply system operating devices for this type of gas engine supply oil at a constant flow rate, which is approximately 10% of the gas supply amount during full-load operation, regardless of engine load or output. However, according to this conventional method, there is no problem with engine combustion operation near the full load operating range, but in the low load operating range where the load factor decreases, the amount of gas supplied may decrease. As a result, the gas in the intake air becomes diluted, and as a result, the ignitability of the air-gas mixture sucked into the cylinder deteriorates, causing a misfire phenomenon in a part of the cylinder, which disturbs the combustion operation of the engine. There was a drawback in terms of stability. By the way, according to the inventor's experiments, the amount of oil to be supplied (hereinafter expressed as a percentage of the amount of gas supplied during full-load operation) necessary to maintain good combustion operation of the engine corresponds to the load factor. It was found that it is possible to completely burn diluted gas by varying the temperature. Specifically, the value was 5 to 6% at full load (100%) (however, the engine cannot be operated with this amount of oil), and 20 to 25% at intermediate load (30%). The present invention solves the above drawbacks by supplying only oil in the low load range and supplying gas and an appropriate amount of oil corresponding to the load factor in the high load range. The purpose of the invention is to provide a fuel supply system with a low load range mode,
Set the high load range mode in advance,
An object of the present invention is to provide an automatic operating device for a fuel supply system that can stabilize engine combustion and improve fuel efficiency by automatically increasing the amount of oil supplied in accordance with a detected load factor. The present invention will be described below based on an illustrated embodiment. First, an overview of the configuration of the embodiment will be explained with reference to the block diagram in FIG. The conventionally known oil pump 2 is connected in parallel to an output section 4 of an engine governor 3, and is driven via respective transmission sections 5 and 6. Each of the transmission parts 5 and 6 is provided with a cylinder device for changing the manner in which the operating force is transmitted. On the other hand, the operation side of the device is provided with a start command button and a stop command button, and an operation panel 7 that outputs engine start and stop signals to a control circuit, which will be described later. Fuel supply amount, etc.
An output sensor 8 that detects operating elements that are correlated with the engine load and transmits a corresponding output value as a signal; and an abnormality sensor 9 that detects engine overspeed, overheating, fuel leakage, etc. and issues an abnormal signal. and a control circuit 10 that outputs a predetermined control signal to the actuation mechanism 11 based on the command signal from the operation panel 7 and the signals from the sensors 8 and 9.
and a working air mechanism that sends working air (constant pressure air and pressure regulating air) to the four pneumatic cylinders (details will be described later) of each of the transmission parts 5 and 6 in response to a control signal input from the control circuit 10. It is equipped with 11. Next, the above configuration will be specifically described with reference to FIG. (a) Output section 4 An operating shaft 14 driven by an output lever 13 of a governor 3 attached to the engine via a rod 12, and a crankshaft 16 fixed to the tip thereof.
The crankshaft 1 is formed by an accelerator crank 15 which is held at
6 is driven by the governor 3 and swings around the operating shaft 14 in the force increasing (FORCE) direction to the left in the figure and in the force decreasing direction (FEEBLE) to the right. (b) Gas side transmission part 5 A gas side transmission shaft 20 which is driven by the lower end of the accelerator crank 15 via the rod 17 and drives the control lever 19 of the gas control valve 1 via the rod 18; Gas side return lever 2 fixed in the middle of the transmission shaft 20
1, and on the left side of the return lever 21, there is a stopper 22, which the return lever 21 hits in a rocking position corresponding to the closed position of the control valve 1, and an appropriate frame supported on the engine body. The first cylinder device 23A (not shown) is fixedly installed on the right side of the return lever 21 and serves as a gas side operation biasing means for pushing the return lever 21 toward the stopper 22. installed in the frame. (c) Oil side transmission section 6 Driven by the upper end of the crank 15 via the rod 24, the rod 25, the differential 26 consisting of a dart pot type spring expander, and the accelerator lever 27 and shaft 27a of the oil pump 2. Adjustment lever 28 integrally connected by
an oil side transmission shaft 29 that drives the rack of the oil pump 2, and an oil side transmission shaft 29 that drives the rack of the oil pump 2 via
It is comprised of a fixed amount oil set lever 30 fixed at two locations in the middle of the pipe 9 and a return lever 31 on the oil side. However, on the left side of the set lever 30,
An adjustment stopper 32 is installed on the frame, which allows adjustment of the contact position of the set lever 30 at a rocking position corresponding to the fixed amount position (approximately 6% oil supply amount). A second cylinder device 23B serving as an oil-side operation biasing means for pushing the return lever 30 is installed on the frame, and a stopper 33 and a third
Cylinder devices 23C are installed on each of the frames. In addition, a projecting piece 28a is provided upright on the upper surface of the adjustment lever 28.
On the right side, there is a fourth cylinder device 23D as an oil side operation drive means for pushing the protrusion 28a.
is installed on the frame. (d) Output sensor 8 Installed on the back side of the governor 3.
The engine output is detected in correlation with the operating stroke of the engine. The output sensor 8 may be an engine output detector that changes the pressure of air supplied from an air supply source inside the sensor according to the displacement of the operating stroke of the governor and outputs it to the third cylinder device 23D. A device called a motion transmitter that has some of the functions of the control circuit 10 is used. Here, in addition to the specific configuration described above, a manual stop section 34 is shown in the drawing, but this stop section 3
4 is not directly related to automatic operation, so it will be explained again later in the explanation. Next, the operation of the operating device of the embodiment configured as described above will be explained with reference to the table shown in FIG. First, when the start command button on the operation panel 7 is pressed, since the load detected by the output sensor 8 is low (30% or less), the operating air mechanism 11 is started under the control of the control circuit 10.
is activated, and each cylinder device 23A to 23D is pneumatically driven to the diesel mode side, that is, the first cylinder device 23A on the gas side is pushed to move the gas side transmission shaft 20 to the closing swing position of the gas control valve. At the same time, the second to fourth cylinder devices 23B to 23D on the oil side are released, thereby freeing the oil side transmission shaft 29 and the adjustment lever 28. In this mode position, the lower end of the crank 15 is fixed immovably, so when the crankshaft 16 moves in the direction of increasing force (INC) due to the drive of the governor 3, the rod 24 follows in the direction of increasing (INC), and the oil pump 2 As a result, the engine speed is gradually increased and the engine is set to a predetermined steady rotational speed. At this time, if the detected load factor exceeds 30% before increasing to the steady rotation speed, the control circuit 1
0 control operation moves to the gas mode, that is, in the gas mode, the cylinder device 23A on the gas side
is released to free the gas-side transmission shaft 20, and the second oil-side cylinder device 23B is pushed to move the transmission shaft 29 to a fixed position (approximately 10% as described above).
As a result, the gas control valve 1 is controlled by the governor and increases the flow rate until the engine reaches steady rotation, but in parallel, the fourth valve on the oil side
Since the cylinder device 23D is supplied with operating air pressure that is regulated in accordance with the load and the reverse nature, the oil pump 2 is operated in the direction of increase against the elasticity of the differential gear 26, thereby controlling the amount of In addition to this, an additional amount (20% to 25%) of oil is supplied to the engine, resulting in stable combustion operation of the engine. Note that when the engine load approaches the full load (100%), the air pressure applied to the fourth cylinder 23D weakens and becomes less than the elasticity of the differential 26, so that only the amount of oil regulated by the adjustment stopper 32 is released. The amount of fuel supplied to the engine is increased or decreased after the fact only by the amount of gas. In addition, if a stop command is issued from the operation panel 7 while the engine is running, or if a detection signal is issued from the abnormality sensor 9, each cylinder device 23A to 23D is transferred to the stop mode by the control operation of the control circuit 10. In other words, the first and third on the gas side and oil side
The cylinder devices 23A and 23C are operated by push,
Since the second and fourth cylinder devices 23B and 23D operate to release, both transmission shafts 20 and 29 are fixed at the oil supply level of approximately 6%, and the gas fuel supply is further stopped, so the engine is stopped. do. The operation of each lever during a mode transition is performed using air pressure as the power medium without any time lag, so it is performed without excessive movement or hunting phenomenon, and the fuel supply is carried out smoothly and reliably. In addition, since the differential 26 has a buffering property, the fuel supply operation is performed more smoothly. By the way, in consideration of the case where a failure occurs in the automatic operation device and a problem occurs in the engine stop mode, a manual stop section 34 is provided.
That is, under normal conditions, the handle 3 is in the free position FREE, where both transmission shafts 20 and 29 are released.
5 is tilted downward and turned to the stop position STOP, the stop cam 36 rotates clockwise in the drawing and pushes up both the gas side and oil side stop levers 37A, 37B.
As a result, each transmission shaft 2
0,29 is driven and locked in the stopped position, the safety of the automatic device is ensured. As described above, according to the automatic operation device for the fuel supply system according to the present invention, the diesel mode and the gas mode are set in advance according to the operating load range of the engine. In addition to supplying oil that has been In addition to making the engine run smoothly and stably, it also prevents unnecessary oil consumption and has the effect of improving the operability and fuel efficiency of gas engines.

[Brief explanation of the drawing]

Fig. 1 is a configuration block diagram of an automatic operating device for a fuel supply system showing an embodiment of the present invention, Fig. 2 is a perspective view of the device, and Fig. 3 is an operation chart of the device in each operating range. It is. 1...Gas control valve, 2...Oil pump, 3...
... Governor, 5, 6 ... Gas side and oil side transmission parts, 8 ... Output sensor, 15 ... Accelerator crank, 19 ... Control lever, 23A,
23B... Cylinder device as operation biasing means,
23D...Cylinder device as operation drive means,
26... Differential, 27... Accelerator lever.

Claims (1)

[Scope of Claims] 1. An operating device for a fuel supply system of a gas engine that uses fuel gas as a main fuel and ignition oil as an auxiliary fuel, which is driven by the output of an engine governor and has a A transmission unit that transmits movement of the operating shaft to which the accelerator crank is attached and one moving end of the accelerator crank to the control lever of the gas control valve, and maintains the gas control valve in the closed position. The gas-side operation biasing means controls the movement of the gas-side transmission part attached in the middle of the transmission path and the other moving end of the accelerator crank of the oil pump via a differential and a variable operation drive means. The oil-side operation biasing means, which is a transmission part that transmits information to the accelerator lever and which holds the oil pump at a predetermined fixed amount operation position, is attached in the middle of the transmission path, and An output sensor for detecting correlated operating elements is provided, and in the low load operating range of the engine, the oil side operation urging means and the oil side operation driving means are activated based on the output signal of the output sensor. At the same time, by activating the gas-side operation biasing means, only the oil controlled by the governor is supplied.On the other hand, in the high-load operating range of the engine, the gas-side operation biasing means is activated, and when the engine is in a high-load operating range, By activating the oil side operating biasing means and the oil side operating driving means and releasing the gas side operating biasing means, the gas controlled by the governor has a characteristic opposite to the load and the load is reduced. An automatic operating device for a fuel supply system, characterized in that the oil is then supplied in an increased amount. 2. The automatic operating device for a fuel supply system according to claim 1, wherein a dart pot type spring expander is provided as the differential. 3. The automatic fuel supply system according to claim 1, characterized in that the oil side operation drive means is provided with a cylinder device to which working air whose pressure is regulated in accordance with the load is added. Operating device.